So true!  We (AV pros) have terms/meanings that vary across the many regions of the world but also within (for instance) allied trades that might not know what we're referencing.  Even worse (perhaps) are terms with more than one meaning depending on what aspect of AV is involved! 

Will take this as a chance to plug AVIXA Audiovisual Glossary of Terms   Let us know if you don't find a term (or disagree with a definition) as we plan to periodically update this in consultation with our volunteer SME's.

The process of examining methods, techniques, and principles to establish a standard to which comparisons can be made.

Very nice summary of some key subtopics to all important (and ongoing) AV network security.  For those interested in more on the topic see also Recommended Practices for Security in Networked Audiovisual Systems | AVIXA.  

Thanks for Paul's deep dive posts (and Christopher for bringing topic up) ... just chiming in to also highlight that there was a correction to the EPR formula from CTS-D Exam Guide, Second Edition.  You can find that at following https://xchange.avixa.org/manage/posts/196069

Just also adding to see this previous post CTS-D Exam Guide (2nd Ed) Errata | AVIXA Xchange

Hello Sheldon - AVIXA doesn't have any standard that covers this situation.  Seems pretty unique but perhaps others in this forum have encountered similar and might comment?

Hi Christopher - interesting question.  Per CTS-D Exam Guide 2nd Edition starting ~page 145, it's an approximation of speaker spacing (creating overlap) delta of the distance (not area) between two speakers from otherwise "edge to edge" coverage distance.  

Hi Chris - Good question; and the way you've phrased it shows you have a good understanding of the topic.  As you reference it's about accounting for max dB loss from source to listener(s).  Assuming uniform coverage pattern and listener positions your second choice - "...where the neighboring loudspeaker provides equal coverage" makes sense.  But for listener positions (if any) around outside edges of the coverage pattern area it could be your first choice; "..edge of dispersion cone".  Given headroom is also part of the equation, can't hurt to use that as the larger of the two.

Nice!  Kudos for your ongoing professional development - keep us posted!